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Block heater humming

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Old 02-03-2013, 04:41 PM
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Block heater humming

should the block heater humm, and radiator hose vibrate when plugged in? It is the water jacket type heater. Is this a stock unit?
 
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Old 02-03-2013, 05:59 PM
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not sure about the hose vibrating, but the heater should hummmm. the heater uses a freeze plug.
 
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